Frozen on the Blue Screen

I spilled coffee onto my keyboard, which is connected by cable to my iMac.

Unplugged the keyboard (and mouse which was plugged into the keyboard) and tried to get all of the coffee out.

Tried to load up my iMac with a wireless keyboard that I don't often use, but which does connect to it. It froze on the WHITE screen.

I looked up troubleshooting options and the leading suggestion was a SAFE boot. I did this, and it worked. I got into my computer and it all looked pretty normal. The same suggestions said that there was a good chance that the iMac would now reboot properly, so I restarted it and...

Frozen on the BLUE screen. It just keeps flashing a little as it cycles around.

I tried the Single User boot with "/sbin/fsck –fy" at the prompt. I had to type that twice for it to come back saying everything was OK. Still freezes on the blue screen when I try to boot.

I tried fixing my permissions just in case (1775) and it didn't accomplish anything.

I'm freezing on the blue screen every time. But that safe boot worked once, so I have hope...

I tried booting it in Target Mode, just to get my work off of it for the time being, but even target mode led to the blue screen.

I read somewhere that you should use Disk Utility in Safe Mode before trying fsck. I did get it to boot that one time in Safe Mode, but when it didn't boot normally on the next couple attempts, I tried fcsk and this may have screwed up what was working with the Safe Mode boot?

That at least leaves open the possibility that it's something rather small and fixable?

Held down C as it loaded up and it got past the old grey screen and seemed to stumble on a new grey screen that I've never seen.

It seems to be a diagram or something. It has two pictures, one above the #1 and the second above the #2. It seems to be suggesting that I open up something (an oval-shaped casing that looks kind of like the face of an external hard drive casing) and do something with two batteries.

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